JPH05200533A - Rotary nozzle - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a rotary nozzle which has a simple structure, is small and lightweight, and on which the driving source of the sliding plate brick can be easily attached and detached. [Constitution] Molten metal container 1 to which fixed plate brick 43 is attached
The worm gear 38 fixed to the bottom portion 2 of the base plate rotatably mounted on the base 31, the support member 46 to which the sliding plate brick 51 is attached and arranged to face the base 31, and the support member 46 are vertically displaceably coupled. A frame 60 connected to the worm gear 38, spring means interposed between the frame 60 and the support member 46, a worm 40 meshing with the worm gear 38, and a drive source for driving the worm 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on the bottom of a molten metal container such as a ladle and a tundish, and rotates a sliding plate brick to adjust the opening of a nozzle hole with a fixed plate brick, The present invention relates to a rotary nozzle for controlling the pouring amount of molten steel or the like.

[0002]

2. Description of the Related Art Rotary nozzles are widely used in ladles for receiving molten steel discharged from a converter and for transporting it, and for injecting it into a mold, and tundish for injecting molten steel from a ladle into a mold. It is used. In particular, a door-type rotary nozzle that opens and closes by rotating a rotor containing sliding plate bricks with a hinge exposes the sliding surface and allows the nakedness of damage to the plate surfaces of the fixed plate bricks and the sliding plate bricks. It has been widely used recently because it has many features such as the fact that it can be confirmed and that it is not necessary to prepare a preliminary set when replacing or repairing bricks and the work is easy.

Such a door-type rotary nozzle is rotatably mounted by a hinge on a bottom of a ladle, a tundish or the like (hereinafter referred to as a molten metal container), directly or through a member. A reduction gear output from a drive source such as a motor is transmitted via an intermediate gear to a gear of a rotor including a sliding plate brick provided on a door, and the rotor, and thus the sliding plate brick, is rotated to thereby generate a nozzle. The opening of is being adjusted.

FIG. 9 is a bottom view of an example of a conventional molten metal container equipped with a rotary nozzle, and FIG. 10 is a sectional view taken along line DD of FIG. In the figure, 1 is a molten metal container, 2 is its bottom plate, and 3 is a rotary nozzle attached to the bottom plate 2.
In the rotary nozzle 3, 4 is the bottom plate 2 by means of bolts 5.
A fixed plate brick 6 is mounted on a base fixed to the.
Reference numeral 8 is an upper nozzle that is inserted into a hole penetrating the bottom plate 2 and the base plate 4 of the molten metal container 1 and is connected to the fixed plate brick 6. 9
Is a fixed frame (door) rotatably connected to the base 4 by a hinge 10.

Reference numeral 11 denotes a rotor housed in a fixed frame 9 and rotatably arranged on a movable frame 16 via a ball bearing 12, and an electric motor 20 on the outer periphery via a speed reducer 21.
A gear 13 that meshes with a gear 22 that is connected to the fixed plate brick 6 is provided. Reference numeral 17 is a collector nozzle that is connected to the sliding plate brick 14. Reference numeral 18 denotes a plurality of spring seats provided in the fixed frame 9 so as to face the movable frame 16 and along the outer circumference of the rotor 11, and coil springs 19 are respectively interposed between the movable frame 16 and the movable frame 16. ..

In the molten metal container having the rotary nozzle as described above, the fixed frame 9 on which the collector nozzle 17 is mounted is closed around the hinge 10 and the free end is fixed to the base 4 by bolts or the like. The sliding surfaces of the plate brick 6 and the sliding plate brick 14 are in close contact with each other by the elastic force of the coil spring 19. Therefore, even if molten steel is injected, both bricks 6,
There is no risk of leakage from between 14. The electric motor 20 is driven as needed, and the rotor 11 is driven via the speed reducer 21.
Is rotated to adjust the opening of the nozzle holes 7 and 15 of both bricks 6 and 14 to control the injection amount of molten steel or the like.

Further, the sliding surfaces of the fixed plate bricks 6 and the sliding plate bricks 14 are inspected for damage, etc., and these bricks 6, 14 are also inspected.
When repairing or replacing the above, the fixed frame 9 may be rotated like a door while the rotor 11 is housed around the hinge 10.

[0008]

Since the rotary nozzle as described above has various features, it is widely used in Japan and overseas, but has the following problems. (1) The electric motor 2 is provided between the electric motor 20 and the rotary nozzle 3.
0 rotation (about 1000 rpm) is significantly reduced (for example, 3
Large reduction gear 21 and intermediate gear 2 for 1/00)
Since 2 is interposed, the entire apparatus becomes large and the equipment cost becomes expensive.

(2) Refining such as degassing is performed by putting the molten metal container 1 in a vacuum chamber. In such a case,
If refining is performed with the electric motor 20 attached to the bottom of the molten metal container 1, the electric motor 20 will be damaged due to high temperature. Therefore, the electric motor 20 is removed before it is placed in the vacuum chamber. However, since the electric motor 20 is attached to the bottom of the molten metal container 1, it is necessary to go under the molten metal container 1 to carry out the attachment / detachment work, and since the weight thereof is large, a crane or the like is required. Not only is it extremely troublesome, but there are also safety issues.

In order to solve such a problem, for example, as shown in Japanese Patent Laid-Open No. 2-263562, a worm gear is attached to a support casing that supports a discharge block,
There is one in which this is rotated by a worm and the reduction gear is omitted. However, in such a rotary nozzle, thrust force acts on the worm gear when the worm rotates in the forward and reverse directions, and the sliding surface between the discharge block and the upper block may open to cause a leakage accident of molten steel or the like.

The present invention has been made to solve the above problems, and an object thereof is to obtain a rotary nozzle having a simple structure, a small size and a light weight, and moreover, a driving source of a sliding plate brick can be easily attached and detached. It was done.

[0012]

A rotary nozzle according to the present invention is mounted on a bottom portion of a molten metal container and has a base plate to which a fixed plate brick having a nozzle hole is attached, and a rotary plate provided on the base plate so as to be rotatable via a bearing. A worm gear mounted and a sliding plate brick having a nozzle hole are attached, a supporting member arranged to face the base, and a supporting member arranged under the supporting member and connected to the worm gear, the supporting member supporting the worm gear. A frame in which members are vertically displaceably coupled, spring means interposed between the frame and the support member, a worm that meshes with the worm gear and the molten metal container are mounted to drive the worm. And driving means.

A hydraulic motor is used as a driving means for the worm, the hydraulic motor is detachably mounted on the molten metal container, and the hydraulic motor is mounted on the outside of the side wall in the vicinity of the bottom of the molten metal container. Is. Further, carbon powder having a particle diameter of 30 μm or less is used as a lubricant for the worm and the worm gear.

[0014]

[Function] When the nozzle holes of the fixed plate brick and the sliding plate brick are fully opened, the nozzle holes of the upper nozzle, fixed plate brick, sliding plate brick and collector nozzle are on the same line, and the maximum amount of molten steel, etc. It is poured. When controlling the pouring amount, the drive source is driven to rotate the worm, and the worm gear meshing with this is rotated at a low speed. The rotation of the worm gear is transmitted to the support member through the frame, and the sliding plate bricks mounted on the worm gear are rotated to adjust the openings of the nozzle holes of the fixed plate bricks and the sliding plate bricks.

When the molten metal container is charged into a vacuum chamber for refining, the hydraulic motor is removed from the molten metal container. At this time, since the hydraulic motor is lightweight, it does not require a crane or the like and can be removed by holding it in the hand. When pouring out from the vacuum tank, the hydraulic motor is installed again. Further, by using the carbon powder as the lubricant for the worm and the worm gear, the worm gear can be driven by the drive source having a relatively low output, and seizure or the like does not occur.

[0016]

1 is a bottom view of an embodiment of a rotary nozzle according to the present invention, FIG. 2 is an AA sectional view thereof, FIG. 3 is a BB sectional view thereof, and FIG. 4 is a CC sectional view thereof. In the figure, 31 is a base fixed to the bottom plate 2 of the molten metal container 1 by a plurality of bolts 32 directly or through members, and 33 is a nozzle hole 35.
Is a through hole into which the upper nozzle 34 having the above is mounted, and 36 is a recess provided in the lower portion of the through hole 33. 37 is a recess 36
An annular groove 38 formed on the outer periphery of the worm gear is a worm gear disposed in the annular groove 37 and rotatably supported by the base 31 via a ball bearing 39, and is formed by enlarging a part of the annular groove 37. A worm 40 that meshes with the worm gear 38 is disposed in the worm chamber 37a. 41 is a seal member 4
2 is a cover that closes the annular groove 37 and the worm chamber 37a through the hole 2. Reference numeral 43 is a fixed plate brick which has a nozzle hole 44, is arranged in the concave portion 36 of the base 31, and is fixed by a bolt 45.

Reference numeral 46 denotes a cylindrical main body 47 having a recess 48.
And a leg portion 49 hung from the main body 47, and a through hole 50 penetrating the leg portion 49 from the concave portion 48 is provided by a supporting member arranged to face the base 31.
A sliding plate brick 51 having a nozzle hole 52 is arranged therein and is fixed by a bolt 53. Reference numeral 54 is a collector nozzle having a nozzle hole 55, which is inserted and supported in the through hole 50 of the support member 46 and whose upper surface is connected to the lower surface of the sliding plate brick 51.

Reference numeral 60 denotes a bottomed cylindrical frame which is arranged below the support member 46 so as to surround the support member 46, and a through hole 61 into which a leg portion 49 of the support member 46 is inserted is provided at the bottom portion. Has been. Arms 62a and 62b are projected from one side of the frame 60, and are connected to the support arms 63a and 63b hanging from the worm gear 38 by a pin 64 to form a hinge 65. Also, the hinge 6
An arm 66 having a U-shaped fitting groove 67 is projectingly provided on the side opposite to 5, and a swinging bolt rotatably fixed to a supporting arm 68 hung from the worm gear 38 is provided in the fitting groove 67. 69 is fitted and fixed by the nut 70.

71a, 71b, 71c and 71d are spring mechanisms interposed between the frame 60 and the support member 46,
A guide shaft 72 whose lower end is loosely fitted in a hole provided in the bottom of the frame 60 and whose upper end is loosely fitted in a hole provided in the support member 46.
In addition, a plurality of disc springs 73 are mounted via spring seats. In the figure, 4 is a spring mechanism 71a to 71d.
Although the example in which the above is provided is shown, it may be provided at three or five or more places, and a coil spring may be used instead of the disc spring 73.

Clamp bolts 75a and 75b are slidably inserted in through holes 74 formed in the bottom of the frame 60 and screwed into screw holes 76 formed in the support member 46. Together with the
The spring pressure of the spring mechanisms 71a to 71d is adjusted, and the support member 46 rotates in cooperation with the frame 60, but can be independently displaced in the vertical direction.

FIG. 5 is a bottom view of a molten metal container equipped with a rotary nozzle according to the present invention, FIG. 6 is a plan view of an embodiment of a main part thereof, and FIG. 7 is a left side view of FIG. Reference numeral 1a is a support plate fixed to the bottom plate 2 of the molten metal container 1 so as to project outward from the side wall. A support member 80 is provided upright on the outer edge of the support plate 80, and swing bolts 81a, 81b are provided on the outer surface thereof. Is provided. 83 is a drive source, a hydraulic motor 85 is attached to the frame 84, and arms 86a and 86b having notches 87 are provided.
Swing bolts 81a and 81b are connected to b, and nut 8
The frame 84 is detachably attached to the support member 80 by screwing 2a and 82b together.

Reference numeral 90 designates the output of the hydraulic motor 85 as the worm 4
0 is a power transmission mechanism, one end of which is connected to the hydraulic motor 85 by, for example, a spline and a spline nut,
A first transmission system 91 having a spline shaft 92 provided at the other end via a universal joint, and a gear 95 having a spline nut at one end and provided at the other end on the shaft 40a of the worm 40 through the universal joint. Second transmission system 9 provided with a matching gear 94
It consists of three and three.

Next, the operation of the present invention configured as described above will be described. When the nozzle holes 44, 52 of the fixed plate brick 43 and the sliding plate brick 51 are fully opened, the nozzle holes 35, 44, 52, 55 of the upper nozzle 34, the fixed plate brick 43, the sliding plate brick 51, and the collector nozzle 54. Are on the same line, and therefore the maximum amount of molten steel or the like is poured.

When controlling the pouring amount, the hydraulic motor 85
To drive the worm 40 to rotate. The rotation of the worm 40 is transmitted to the worm gear 38, and this is transmitted to, for example, 1/5.
Rotate at a reduction ratio of 0 to 1/90. Worm gear 38
Is transmitted to the frame 60 via the hinge 65 and the swing bolt 69, and the rotation of the frame 60 is transmitted to the support member 46 via the clamp bolts 75a and 75b, and the support member 46 is attached to the slide member. Rotating together with the plate brick 51, the opening degree of the nozzle hole 44 of the fixed plate brick 43 and the nozzle hole 52 of the sliding plate brick 51 is adjusted.

When performing maintenance and inspection of the sliding surfaces of the fixed plate bricks 43 and the sliding plate bricks 51 and their replacement, the clamp bolts 75a and 75b are tightened and the support member 46 is lowered to restrain the spring force. Then, the swing bolt 69 is rotated by loosening the nut 70, and is removed from the fitting groove 67 to remove the hinge 65.
If the frame 60 is rotated around, the frame 60,
Support member 46, sliding plate brick 51 and collector nozzle 54
3 is opened like a door as shown by the chain line in FIG. 3 to expose the sliding surfaces of the fixed plate bricks 43 and the sliding plate bricks 51, so that they can be easily inspected or replaced. it can.

When maintenance, inspection or replacement is completed, the frame 60 is rotated around the hinge 65 to close the unit, the swing bolt 69 is fitted into the fitting groove 67 and the nut 70 is tightened. Then, the clamp bolts 75a and 75b are loosened so that the surface pressure is applied to the sliding surfaces of the fixed plate brick 43 and the sliding plate brick 51. At this time, the support member 46 and the sliding plate brick 51 are evenly pushed up by the plurality of spring mechanisms 71a to 71d, so that the sliding plate brick 51 is brought into close contact with the sliding surface of the fixed plate brick 43 with a uniform pressure. Can be made.

Next, when the molten metal container 1 is placed in a vacuum chamber for refining such as degassing, the nuts 82a, 82b are loosened and the swing bolts 81a, 8 are placed before being placed in the vacuum chamber.
1b is rotated and removed from the arms 86a and 86b, and the drive source 83
Should be pulled toward you and removed from the power transmission mechanism 90. When the molten metal container 1 is taken out from the vacuum tank and molten steel or the like is poured, the drive source 83 is attached in the reverse order.

By the way, in the present invention, the sliding plate brick 5 is used.
The support member 46 to which 1 is attached is rotated by the worm 40. As described above, the worm exerts a large thrust force on the worm gear during forward rotation or reverse rotation, but in the present invention, this thrust force is applied. Since the base 31 is received by the ball bearing 39 so as not to affect the frame 60 and the support member 46,
The sliding surfaces of the fixed plate bricks 43 and the sliding plate bricks 60 will not open and molten steel will not leak.

As is well known, when a worm gear is driven by a worm, the quality of the lubricant interposed between the two is extremely important. Generally, grease is used as such a lubricant, but in the case of a rotary nozzle, it is used at high temperatures, so the mineral oil volatilizes and the residue solidifies, and the function as a lubricant is lost. There is a problem. Therefore, the inventors of the present invention conducted various experiments using various lubricants, and as a result, found that the particle size was 0.01 to 3
When a carbon powder of 0 μm, preferably about 4 to 8 μm was put in the worm chamber 37a at about 50 to 70% of its volume, very good results were obtained. FIG. 8 shows a particle diameter of carbon powder and a hydraulic motor 85 for driving the worm 40.
In the diagram showing the relationship with the pressure of, the pressure of the hydraulic motor 85 rises sharply when the particle diameter of the carbon powder exceeds 30 μm, so it is understood that the carbon powder having the particle diameter of 30 μm or less is desirable as the lubricant.

In the above description, the present invention is mainly applied to the rotary nozzle for pouring molten steel, but it can also be applied to the rotary nozzle for pouring other metals. Further, the case where the worm 40 is driven by the hydraulic motor 85 has been described, but an electric motor may be used instead of the hydraulic motor. However, when an electric motor is used, the number of revolutions is higher than that of a hydraulic motor.
It is necessary to decelerate to about / 6. Further, the structure of each part is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention.

[0031]

As is apparent from the above description, the present invention is constructed such that the worm gear provided on the base is rotated by the worm to rotate the sliding plate bricks, and the worm is detachable from the molten metal container. Since it is driven by the hydraulic motor mounted on, the following effects can be obtained. (1) Since the reduction gear is unnecessary, the entire device can be made compact and lightweight. (2) Since the worm gear is held on the board via the bearing, the thrust force acting on the worm gear is received by the board via the bearing when the worm rotates forward and backward, so that the fixed plate brick and the sliding plate brick slide. Does not affect the pressing force of the surface.

(3) Since the worm gear is provided on the base,
The worm gear is always held in a fixed position regardless of whether the support member, the frame, etc. are opened or closed. Therefore, the meshing portion between the worm and the worm gear can have a box structure, so that the lubricant can be reliably used. (4) Since the worm and its drive source are connected by the shaft, the drive source can be attached at an arbitrary position such as a place away from the heat source. (5) Since the worm is driven by a lightweight hydraulic motor that is detachably attached to the molten metal container, the attaching and detaching work is extremely easy without the need for a crane or the like. (6) If the hydraulic motor for driving the worm is mounted on the outside of the side wall of the molten metal container, the attachment / detachment work is easier. (7) Particle size of 3 as a lubricant for worms and worm gears
By using a carbon powder of 0 μm or less, the worm gear can be driven by a drive source having a relatively low output, and seizure or the like does not occur.

[Brief description of drawings]

FIG. 1 is a bottom view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line CC of FIG.

FIG. 5 is a bottom view of a molten metal container equipped with a rotary nozzle according to the present invention.

FIG. 6 is a plan view of an embodiment of a worm drive system.

FIG. 7 is a side view of FIG.

FIG. 8 is a diagram showing the relationship between the particle size of carbon powder used as a lubricant and the pressure of a hydraulic motor.

FIG. 9 is a bottom view of a molten metal container equipped with a conventional rotary nozzle.

10 is a sectional view taken along line DD of FIG.

[Explanation of symbols]

 1 Molten Metal Container 2 Bottom Plate 3 Rotary Nozzle 31 Base 37 Annular Groove 37a Worm Chamber 38 Worm Gear 39 Ball Bearing 40 Worm 41 Cover 43 Fixed Plate Brick 46 Supporting Member 51 Sliding Plate Brick 54 Collector Nozzle 60 Frame 65 Hinge 69 Swing Bolt 71a- 71d Spring mechanism 75a, 75b Clamp bolt 80 Support member 83 Drive source 85 Hydraulic motor 90 Power transmission mechanism

Front page continuation (71) Applicant 000220767 Tokyo Ceramic Co., Ltd. 1-2-8 Marunouchi, Chiyoda-ku, Tokyo Steel Building (72) Inventor Hisao Inubushi 1-29-3 Kajiyama, Tsurumi-ku, Yokohama-shi, Kanagawa (72) Inventor Motoo Amano 1-16-8 Kamata, Ota-ku, Tokyo (72) Inventor Hitoshi Matsuura 3-17-15 Motohaneda, Ota-ku, Tokyo (72) Inventor Yuji Hayakawa, 2135, Naze-cho, Totsuka-ku, Yokohama-shi, Kanagawa 13

Claims (4)

[Claims] 1. A rotary nozzle which is mounted on the bottom of a molten metal container and which controls the opening of a nozzle hole with a fixed plate brick by rotating a sliding plate brick to control the pouring amount of molten steel or the like. A base fixed to the bottom of the metal container, to which a fixed plate brick having a nozzle hole is attached, a worm gear rotatably attached to the base via a bearing, and a sliding plate brick having a nozzle hole are attached. A supporting member arranged to face the base; a frame arranged under the supporting member and connected to the worm gear; and a frame in which the supporting member is vertically displaceably coupled to the supporting member; the frame and the supporting member; A rotor provided with spring means interposed between a member, a worm that meshes with the worm gear, and drive means that is mounted on the molten metal container and drives the worm. Nozzle. 2. The rotary nozzle according to claim 1, wherein a hydraulic motor is used as a driving means for the worm, and the hydraulic motor is detachably attached to the molten metal container. 3. The rotary nozzle according to claim 2, wherein a hydraulic motor is mounted on the outer periphery of the side wall in the vicinity of the bottom of the molten metal container. 4. A rotary nozzle according to claim 1, wherein carbon powder having a particle diameter of 30 μm or less is used as a lubricant for the worm and the worm gear.